Azbil DC3-Wire Cylindrical Proximity Switches have enhanced circuit protection that include surge absorption, load short circuit and reverse connection countermeasures. Sensing distance is 1.5 mm to 10 mm depending on the size. The main unit, Firefly indicator, is available in sizes (O.D.) M8, M12, M12 (long-body), M18, and M30. IP67 Sealed.